◎ 题干
—When_____ you_____teaching in our school, Mr. Smith?
—I_____here since 1998.

A. did, started; have been teaching  
B. did, start; taught
C. did, start; have been teaching    
D. have, been starting; taught
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“-When_____ you_____teaching in our school,Mr. Smith?-I_____here since 1998.[ ]A. did , started ; have been teachingB. did, start; taughtC. did, start; h…”主要考查了你对  【一般过去时】【现在完成进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。